In Experimental Farm of Agronomy Department, Faculty of Agriculture, Mansoura University, Egypt, season 2020, Heterosis and compining ability was studied in ten F₁ single crosses with five parents (Sd₁₂ , Inbred bo₁₂ , 72 , Rg₈ ,and 56) planted in a Randomized complete Block Design (RCBD) with 3 replicates. The analysis of variance showed highly significant mean squares of general combining ability (GCA) and specific combining ability (SCA) for all studied traits, i.e. length of ear, weight of ear, No. of grains per ear, 100-grain weight, shelling % and grain yield for each plant, protein %, carbohydrate % and oil %, except GCA for ear diameter and GCA and SCA for cub diameter. The proportion of GCA/SCA was fewer than unity for all considered traits. GCA effects achieved that inbred lines P₁ (Sd₁₂) and P₄ (Rg8) they were perfect general combiners for grain/plant yield. Highly significant rates of SCA effects showed that the best F1 cross combinations were P₁ xP₃, P₁ xP₄, P₂ xP₅ and P₃×P₄ for grain yield / plant .The most of cross combinations manifested positive and very significant heterosis over mid and better parents for all traits studied except number grain per ear and  carbohydrates percentage for better parent and shelling percentage for over mid and better parents. Highest positive significant value of heterotic effects relative to mid and better parents for grain yield per plant were obtained by P₁xP₄.